Gast, R. K.; Guraya, R.; Holt, P. S. Frequency and Persistence of Fecal Shedding Following Exposure of Laying Hens to Different Oral Doses of Salmonella Enteritidis. Int. J. Poult. Sci. 2011, 10 (10), 750–756. https://doi.org/10.3923/ijps.2011.750.756.